Answer
$4.6994\times 10^{-19}J$
Work Step by Step
We know that
$\nu=\frac{c}{\lambda}$
$\nu=\frac{2.998\times 10^8}{4.227\times 10^{-7}}=7.025\times 10^{14}\frac{m}{s}$
We also know that
$E=h\nu $
$E=6.626\times 10^{-34}\times 7.0925\times 10^{14}=4.6994\times 10^{-19}J$